geometry_remover.py 2.13 KB
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# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Copyright(C) 2013-2018 Max-Planck-Society
#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.

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from __future__ import absolute_import, division, print_function
from ..compat import *
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from ..domains.unstructured_domain import UnstructuredDomain
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from ..domain_tuple import DomainTuple
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from .linear_operator import LinearOperator
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class GeometryRemover(LinearOperator):
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    """Operator which transforms between a structured and an unstructured
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    domain.

    Parameters
    ----------
    domain: Domain, tuple of Domain, or DomainTuple:
        the full input domain of the operator.

    Notes
    -----
    The operator will convert every sub-domain of its input domain to an
    UnstructuredDomain with the same shape. No weighting by volume factors
    is carried out.
    """
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    def __init__(self, domain):
        super(GeometryRemover, self).__init__()
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        self._domain = DomainTuple.make(domain)
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        target_list = [UnstructuredDomain(dom.shape) for dom in self._domain]
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        self._target = DomainTuple.make(target_list)
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    @property
    def domain(self):
        return self._domain

    @property
    def target(self):
        return self._target

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    @property
    def capability(self):
        return self.TIMES | self.ADJOINT_TIMES

    def apply(self, x, mode):
        self._check_input(x, mode)
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        if mode == self.TIMES:
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            return x.cast_domain(self._target)
        return x.cast_domain(self._domain)